Over 2,000 years ago, Eratosthenes made a remarkably accurate measurement of the earth's circumference. This project is a recreation of that experiment and invites the collaboration of students living at different latitudes to take measurements of shadows, share data, use a spreadsheet (optional) to make comparisons, and then share their results. Intende for grades 5-12, though all may participate. Please check the web site for signup dates. The Noon Day Project is sponsored by the Center for Improved Engineering & Science Education (CIESE). They also sponsor and design interdisciplinary projects that teachers throughout the world use to enhance their curricula through compelling use of the Internet.